Accession Number : ADA317379

Title :   Ceramic Bearing Development, Vol 2. Development of Surface Acoustic Wave NDE for Silicon Nitride Balls.

Descriptive Note : Interim rept. 1 Jul 92-1 Oct 94,

Corporate Author : NORTON ADVANCED CERAMICS EAST GRANBY CT

Personal Author(s) : Hseith, Chunk-Kao P. ; Khuri-Yakub, Butrus T. ; Burk, Charles

PDF Url : ADA317379

Report Date : MAR 1995

Pagination or Media Count : 61

Abstract : The Major Objective of the Development of a Surface Acoustic Wave Nondestructive Evaluation (NDE) Technique for Silicon Nitride Balls was to improve hybrid bearing reliability by the elimination of critical size flaws that cause early failures. A Surface Acoustic Wave NDE technique was developed for Norton Advanced Ceramics NBD-200 silicon nitride balls. System performance was verified on balls with both natural and artificial flaws. A production lot of NBD-200 balls was tested using this method. The production lot was sorted for fatigue testing at 2.9 MPa (420 KSI) contact stress at The Timken Co. Results suggest that the technique can readily identify certain life limiting flaws. However, fatigue testing of balls inspected with this technique showed no improvement in reliability.

Descriptors :   *NONDESTRUCTIVE TESTING, *CERAMIC MATERIALS, *SILICON NITRIDES, *SURFACE ACOUSTIC WAVES, *BALL BEARINGS, STRESSES, PRODUCTION, SIZES(DIMENSIONS), RELIABILITY, DEFECTS(MATERIALS), HYBRID SYSTEMS, FATIGUE TESTS(MECHANICS).

Subject Categories : Line, Surface and Bulk Acoustic Wave Devices
      Inorganic Chemistry
      Refractory Fibers
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE